EP3981862B1 - Acrylate-based copolymer, method for producing said copolymer, friction inhibitor using said copolymer, and lubricating composition containing said friction inhibitor - Google Patents
Acrylate-based copolymer, method for producing said copolymer, friction inhibitor using said copolymer, and lubricating composition containing said friction inhibitor Download PDFInfo
- Publication number
- EP3981862B1 EP3981862B1 EP20819237.7A EP20819237A EP3981862B1 EP 3981862 B1 EP3981862 B1 EP 3981862B1 EP 20819237 A EP20819237 A EP 20819237A EP 3981862 B1 EP3981862 B1 EP 3981862B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ppm
- group
- acrylate
- mol
- polymerizable monomer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 title claims description 179
- 229920001577 copolymer Polymers 0.000 title claims description 155
- 239000000203 mixture Substances 0.000 title claims description 102
- 239000003112 inhibitor Substances 0.000 title description 10
- 238000004519 manufacturing process Methods 0.000 title description 3
- 230000001050 lubricating effect Effects 0.000 title 1
- 239000000178 monomer Substances 0.000 claims description 414
- 239000000470 constituent Substances 0.000 claims description 118
- -1 hydroxyalkyl acrylate Chemical compound 0.000 claims description 106
- 239000002199 base oil Substances 0.000 claims description 71
- 239000003638 chemical reducing agent Substances 0.000 claims description 61
- 125000004432 carbon atom Chemical group C* 0.000 claims description 57
- 239000010687 lubricating oil Substances 0.000 claims description 57
- 125000000217 alkyl group Chemical group 0.000 claims description 49
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 44
- 229920002554 vinyl polymer Polymers 0.000 claims description 26
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 24
- 125000002947 alkylene group Chemical group 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 19
- 125000005250 alkyl acrylate group Chemical group 0.000 claims description 18
- 125000003118 aryl group Chemical group 0.000 claims description 16
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 13
- 230000000379 polymerizing effect Effects 0.000 claims description 6
- 230000002401 inhibitory effect Effects 0.000 claims description 5
- 238000002156 mixing Methods 0.000 description 100
- 239000012459 cleaning agent Substances 0.000 description 68
- 239000002270 dispersing agent Substances 0.000 description 37
- 239000011575 calcium Substances 0.000 description 32
- 239000003795 chemical substances by application Substances 0.000 description 32
- 239000011777 magnesium Substances 0.000 description 22
- 230000000694 effects Effects 0.000 description 17
- 239000003921 oil Substances 0.000 description 16
- 235000019198 oils Nutrition 0.000 description 16
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 12
- 239000002480 mineral oil Substances 0.000 description 11
- 150000002430 hydrocarbons Chemical group 0.000 description 10
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 9
- 229910052717 sulfur Inorganic materials 0.000 description 9
- 239000003963 antioxidant agent Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 8
- 125000002704 decyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 8
- 235000014113 dietary fatty acids Nutrition 0.000 description 8
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 8
- 230000001747 exhibiting effect Effects 0.000 description 8
- 229930195729 fatty acid Natural products 0.000 description 8
- 239000000194 fatty acid Substances 0.000 description 8
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 8
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 8
- 125000002960 margaryl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 235000010446 mineral oil Nutrition 0.000 description 8
- 125000001421 myristyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 8
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 8
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 8
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 8
- 125000002958 pentadecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 8
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 8
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 8
- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 8
- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 8
- 150000002148 esters Chemical class 0.000 description 7
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 7
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 125000004434 sulfur atom Chemical group 0.000 description 7
- WMYJOZQKDZZHAC-UHFFFAOYSA-H trizinc;dioxido-sulfanylidene-sulfido-$l^{5}-phosphane Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([S-])=S.[O-]P([O-])([S-])=S WMYJOZQKDZZHAC-UHFFFAOYSA-H 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 6
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 6
- 125000001931 aliphatic group Chemical group 0.000 description 6
- 125000001204 arachidyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 6
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 6
- 229910052749 magnesium Inorganic materials 0.000 description 6
- 125000001196 nonadecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 6
- 229920013639 polyalphaolefin Polymers 0.000 description 6
- 229920005862 polyol Polymers 0.000 description 6
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- 239000000654 additive Substances 0.000 description 5
- 239000002585 base Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 150000005690 diesters Chemical class 0.000 description 5
- 150000004665 fatty acids Chemical class 0.000 description 5
- KHYKFSXXGRUKRE-UHFFFAOYSA-J molybdenum(4+) tetracarbamodithioate Chemical compound C(N)([S-])=S.[Mo+4].C(N)([S-])=S.C(N)([S-])=S.C(N)([S-])=S KHYKFSXXGRUKRE-UHFFFAOYSA-J 0.000 description 5
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 5
- KZNICNPSHKQLFF-UHFFFAOYSA-N succinimide Chemical compound O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 5
- JRZJOMJEPLMPRA-UHFFFAOYSA-N 1-nonene Chemical compound CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 4
- 229920002367 Polyisobutene Polymers 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 125000003342 alkenyl group Chemical group 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 4
- 239000003999 initiator Substances 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 239000005078 molybdenum compound Substances 0.000 description 4
- 150000002752 molybdenum compounds Chemical class 0.000 description 4
- 125000004430 oxygen atom Chemical group O* 0.000 description 4
- 239000012188 paraffin wax Substances 0.000 description 4
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 4
- 229920001083 polybutene Polymers 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 229960002317 succinimide Drugs 0.000 description 4
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 3
- RUFPHBVGCFYCNW-UHFFFAOYSA-N 1-naphthylamine Chemical compound C1=CC=C2C(N)=CC=CC2=C1 RUFPHBVGCFYCNW-UHFFFAOYSA-N 0.000 description 3
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000007983 Tris buffer Substances 0.000 description 3
- 150000001298 alcohols Chemical class 0.000 description 3
- 239000002518 antifoaming agent Substances 0.000 description 3
- 230000003078 antioxidant effect Effects 0.000 description 3
- 125000004429 atom Chemical group 0.000 description 3
- IAQRGUVFOMOMEM-UHFFFAOYSA-N but-2-ene Chemical group CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- AVVIDTZRJBSXML-UHFFFAOYSA-L calcium;2-carboxyphenolate;dihydrate Chemical compound O.O.[Ca+2].OC1=CC=CC=C1C([O-])=O.OC1=CC=CC=C1C([O-])=O AVVIDTZRJBSXML-UHFFFAOYSA-L 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 3
- 239000006078 metal deactivator Substances 0.000 description 3
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 3
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 3
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 3
- IAQRGUVFOMOMEM-ONEGZZNKSA-N trans-but-2-ene Chemical group C\C=C\C IAQRGUVFOMOMEM-ONEGZZNKSA-N 0.000 description 3
- IKXFIBBKEARMLL-UHFFFAOYSA-N triphenoxy(sulfanylidene)-$l^{5}-phosphane Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=S)OC1=CC=CC=C1 IKXFIBBKEARMLL-UHFFFAOYSA-N 0.000 description 3
- 239000004711 α-olefin Substances 0.000 description 3
- ZMZHRHTZJDBLEX-UHFFFAOYSA-N (2-phenylphenyl) prop-2-enoate Chemical class C=CC(=O)OC1=CC=CC=C1C1=CC=CC=C1 ZMZHRHTZJDBLEX-UHFFFAOYSA-N 0.000 description 2
- JNYAEWCLZODPBN-JGWLITMVSA-N (2r,3r,4s)-2-[(1r)-1,2-dihydroxyethyl]oxolane-3,4-diol Chemical compound OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O JNYAEWCLZODPBN-JGWLITMVSA-N 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 2
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- AFFLGGQVNFXPEV-UHFFFAOYSA-N 1-decene Chemical compound CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 2
- CRSBERNSMYQZNG-UHFFFAOYSA-N 1-dodecene Chemical compound CCCCCCCCCCC=C CRSBERNSMYQZNG-UHFFFAOYSA-N 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
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- HFDVRLIODXPAHB-UHFFFAOYSA-N 1-tetradecene Chemical compound CCCCCCCCCCCCC=C HFDVRLIODXPAHB-UHFFFAOYSA-N 0.000 description 2
- WJFKNYWRSNBZNX-UHFFFAOYSA-N 10H-phenothiazine Chemical compound C1=CC=C2NC3=CC=CC=C3SC2=C1 WJFKNYWRSNBZNX-UHFFFAOYSA-N 0.000 description 2
- DKCPKDPYUFEZCP-UHFFFAOYSA-N 2,6-di-tert-butylphenol Chemical compound CC(C)(C)C1=CC=CC(C(C)(C)C)=C1O DKCPKDPYUFEZCP-UHFFFAOYSA-N 0.000 description 2
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- SZAQZZKNQILGPU-UHFFFAOYSA-N 2-[1-(2-hydroxy-3,5-dimethylphenyl)-2-methylpropyl]-4,6-dimethylphenol Chemical compound C=1C(C)=CC(C)=C(O)C=1C(C(C)C)C1=CC(C)=CC(C)=C1O SZAQZZKNQILGPU-UHFFFAOYSA-N 0.000 description 2
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- 125000000094 2-phenylethyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])C([H])([H])* 0.000 description 2
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- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
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- JOZYBUSXAGFNKN-UHFFFAOYSA-N N-pyridin-2-ylpyridin-2-amine Chemical compound N(c1ccccn1)c1ccccn1.N(c1ccccn1)c1ccccn1 JOZYBUSXAGFNKN-UHFFFAOYSA-N 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- 239000005642 Oleic acid Substances 0.000 description 2
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
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Classifications
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Definitions
- the present invention relates to a lubricating oil composition
- a lubricating oil composition comprising a base oil and a friction reducer consisting of an acrylate-based copolymer exhibiting a satisfactory friction-reducing effect. Further, the present invention relates to a method of producing the lubricating oil composition, to the use of the acrylate-based copolymer as a friction reducer in a base oil, and to a method of inhibiting friction of a base oil.
- a lubricating oil used in instruments and machines improves the friction and abrasion characteristics thereof by being added with friction reducers, such as an extreme-pressure agent, a friction modifier, and an abrasion-preventing agent, in order to suppress seizure as much as possible to prolong the lifetimes of the instruments and machines.
- friction reducers such as an extreme-pressure agent, a friction modifier, and an abrasion-preventing agent
- an organic molybdenum compound is well known as a friction reducer having a high friction-reducing effect (Patent Literatures 1 and 2).
- Patent Literatures 1 and 2 an organic molybdenum compound is well known as a friction reducer having a high friction-reducing effect
- the organic molybdenum compound does not always exhibit a friction-reducing effect under any use conditions.
- Patent Literature 3 as an extreme-pressure agent for a lubricating oil excellent in dissolution stability and extreme-pressure performance, there is a description of an extreme-pressure agent for a lubricating oil consisting of a copolymer containing an alkyl acrylate and a hydroxyalkyl acrylate as essential constituent monomers.
- Patent Literature 4 there is a description that a lubricity improver for a fuel oil containing a copolymer containing a fatty acid, a monomer such as a (meth)acrylate, and a hydroxyl group-containing vinyl monomer as essential constituent monomers improves lubrication characteristics without clouding, solidification, or precipitation of crystals even in low temperature states, such as a winter season and a cold region.
- a sufficient friction-reducing effect still cannot be exhibited, and there has been a problem in improving the friction performance of a lubricating oil.
- EP2792733 A1 discloses a lubricating oil composition and a method of inhibiting friction of a base oil with an acrylate based-copolymer. It
- an object of the present invention is to provide an acrylate-based copolymer that can be used as a friction reducer exhibiting a satisfactory friction-reducing effect.
- the present invention provides a lubricating oil composition
- a lubricating oil composition comprising a base oil and a friction reducer, wherein the friction reducer consists of an acrylate-based copolymer obtained by polymerizing constituent monomers containing a polymerizable monomer (a) consisting of an alkyl acrylate-based monomer represented by the following general formula (1) in an amount of from at least 10 mol % with respect to a total number of moles of the constituent monomers, a polymerizable monomer (b) consisting of an alkylene glycol acrylate-based monomer represented by the following general formula (2) in an amount of from 5 mol% to 50 mol% with respect to the total number of moles of the constituent monomers, and at least one kind of polymerizable monomer (c) selected from the group consisting of an aromatic vinyl-based monomer (c-1) and a short-chain alkyl acrylate-based monomer (c-2) represented by the following general formula (3) in an amount of from 1
- the present invention provides a lubricating oil composition
- a lubricating oil composition comprising a base oil and a friction reducer, wherein the friction reducer consists of an acrylate-based copolymer obtained by polymerizing constituent monomers containing a polymerizable monomer (a) consisting of an alkyl acrylate-based monomer represented by the following general formula (1) in an amount of from 30 mol% to 95 mol% with respect to a total number of moles of the constituent monomers, and a polymerizable monomer (b) consisting of an alkylene glycol acrylate-based monomer represented by the following general formula (2) in an amount of from 5 mol% to 70 mol% with respect to the total number of moles of the constituent monomers: where R 1 represents an alkyl group having 4 to 18 carbon atoms, and A 1 represents a hydrogen atom; and where R 2 represents an alkylene group having 2 to 4 carbon atoms, R 3 represents a hydrogen atom or an alkyl group having 1 to
- the above-described acrylate-based copolymer used as a friction reducer exhibits a satisfactory friction-reducing effect.
- a polymerizable monomer (a) for forming the above-described acrylate-based copolymer is an alkyl acrylate-based polymerizable monomer represented by the following general formula (1):
- R 1 in the general formula (1) represents an alkyl group having 4 to 18 carbon atoms.
- Examples of such group include: linear alkyl groups, such as a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, and an octadecyl group; and branched alkyl groups, such as a branched butyl group, a branched pentyl group, a branched hexyl group, a branched heptyl group, a branched octyl group, a branched non
- R 1 is preferably an alkyl group having 6 to 18 carbon atoms, more preferably an alkyl group having 8 to 16 carbon atoms, still more preferably an alkyl group having 10 to 14 carbon atoms, particularly preferably a linear alkyl group having 10 to 14 carbon atoms, most preferably a linear alkyl group having 12 carbon atoms out of those groups.
- a 1 in the general formula (1) represents a hydrogen atom.
- a 1 in the general formula (1) represents a hydrogen atom.
- a 1 is a hydrogen atom (not a hydrocarbon group, such as a methyl group)
- an acrylate-based copolymer that can be used as a friction reducer exhibiting a satisfactory friction-reducing effect can be obtained.
- a polymerizable monomer (b) for forming the above-described acrylate-based copolymer is an alkylene glycol acrylate-based polymerizable monomer represented by the following general formula (2):
- R 2 in the general formula (2) represents an alkylene group having 2 to 4 carbon atoms.
- examples of such group include an ethylene group, a propylene group, a butylene group, a methylethylene group, a methylpropylene group, and a dimethylethylene group.
- an alkylene group having 2 or 3 carbon atoms is preferred, and an ethylene group is more preferred.
- R 3 in the general formula (2) represents a hydrogen atom or an alkyl group having 1 to 30 carbon atoms.
- the alkyl group having 1 to 30 carbon atoms include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, an octadecyl group, a nonadecyl group, an icosyl group, a heneicosyl group, a docosyl group, a tricosyl group, a tetracosyl
- R 3 is preferably a hydrogen atom or an alkyl group having 1 to 18 carbon atoms, more preferably a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, still more preferably an alkyl group having 1 to 3 carbon atoms, most preferably a methyl group out of those groups.
- a 2 in the general formula (2) represents a hydrogen atom.
- a 2 in the general formula (2) represents a hydrogen atom.
- a 2 is a hydrogen atom (not a hydrocarbon group, such as a methyl group)
- an acrylate-based copolymer that can be used as a friction reducer exhibiting a satisfactory friction-reducing effect can be obtained.
- n in the general formula (2) represents a number from 2 to 20.
- "n" is preferably from 6 to 20, more preferably from 8 to 18, still more preferably from 11 to 16, most preferably from 11 to 15.
- an average value of "n” is preferably from 8 to 16, more preferably from 10 to 14, still more preferably from 12 to 14, most preferably 13.
- a polymerizable monomer (c) for forming the above-described acrylate-based copolymer is at least one kind of polymerizable monomer selected from the group consisting of an aromatic vinyl-based monomer (c-1) and a short-chain alkyl acrylate-based monomer (c-2) represented by the following general formula (3):
- R 4 in the general formula (3) represents an alkyl group having 1 to 3 carbon atoms. Examples of such group include a methyl group, an ethyl group, and a propyl group. From the viewpoints of the friction characteristics of an acrylate-based copolymer to be obtained, R 4 is preferably a methyl group or an ethyl group, more preferably an ethyl group out of those groups.
- a 3 in the general formula (3) represents a hydrogen atom.
- a 3 in the general formula (3) represents a hydrogen atom.
- a 3 is a hydrogen atom (not a hydrocarbon group, such as a methyl group)
- an acrylate-based copolymer that can be used as a friction reducer exhibiting a satisfactory friction-reducing effect can be obtained.
- the aromatic vinyl-based monomer (c-1) that may be used in the present invention is not particularly limited as long as the monomer is a compound having a polymerizable vinyl group and an aromatic hydrocarbon group, and examples thereof include: a phenoxypolyethylene glycol acrylate, an ethoxylated o-phenylphenol acrylate, and an aromatic acrylate-based monomer represented by the following general formula (4); monocyclic vinyl monomers, such as styrene, vinyltoluene, 2,4-dimethylstyrene, and 4-ethylstyrene; and polycyclic vinyl monomers, such as 2-vinylnaphthalene, 1,5-divinylnaphthalene, and 4-vinylbiphenyl.
- R 5 in the general formula (4) represents an alkylene group having 1 to 4 carbon atoms.
- examples of such group include a methylene group, an ethylene group, a propylene group, a butylene group, a methylethylene group, a methylpropylene group, and a dimethylethylene group.
- R 5 is preferably an alkylene group having 1 or 2 carbon atoms, more preferably a methylene group out of those groups.
- a 4 in the general formula (4) represents a hydrogen atom.
- a 4 in the general formula (4) represents a hydrogen atom.
- a 4 is a hydrogen atom (not a hydrocarbon group, such as a methyl group)
- an acrylate-based copolymer that can be used as a friction reducer exhibiting a satisfactory friction-reducing effect can be obtained.
- the polymerizable monomer (c) contains, as the aromatic vinyl-based monomer (c-1), preferably at least one kind selected from a phenoxypolyethylene glycol acrylate, an ethoxylated o-phenylphenol acrylate, the aromatic acrylate-based monomer represented by the general formula (4), and an aromatic vinyl monomer having 8 to 14 carbon atoms, more preferably at least one kind of the aromatic acrylate-based monomer represented by the general formula (4) out of those monomers.
- the aromatic vinyl-based monomer (c-1) preferably at least one kind selected from a phenoxypolyethylene glycol acrylate, an ethoxylated o-phenylphenol acrylate, the aromatic acrylate-based monomer represented by the general formula (4), and an aromatic vinyl monomer having 8 to 14 carbon atoms, more preferably at least one kind of the aromatic acrylate-based monomer represented by the general formula (4) out of those monomers.
- the polymerizable monomer (c) may consist of the aromatic vinyl-based monomer (c-1) or the short-chain alkyl acrylate-based monomer (c-2), or may consist of the aromatic vinyl-based monomer (c-1) and the short-chain alkyl acrylate-based monomer (c-2).
- the polymerizable monomer (c) consists of preferably the aromatic vinyl-based monomer (c-1) or the short-chain alkyl acrylate-based monomer (c-2), more preferably the aromatic vinyl-based monomer (c-1).
- the polymerizable monomer (c) contain, as the aromatic vinyl-based monomer (c-1), the aromatic acrylate-based monomer represented by the general formula (4).
- the polymerizable monomer (c) may consist of the aromatic acrylate-based monomer represented by the general formula (4).
- the constituent monomers contain, as the polymerizable monomer (c), the aromatic vinyl-based monomer (c-1) and the short-chain alkyl acrylate-based monomer (c-2), there is no particular limitation on a ratio between the composition ratio of the aromatic vinyl-based monomer (c-1) and the composition ratio of the short-chain alkyl acrylate-based monomer (c-2) in the constituent monomers for forming the acrylate-based copolymer, but the ratio (c-1) : (c-2) is, for example, preferably from 10:90 to 90:10, more preferably from 40:60 to 80:20 by mole.
- the constituent monomers for forming the above-described acrylate-based copolymer contain the polymerizable monomer (a) in an amount of from 10 mol% to 95 mol% with respect to the total number of moles of the constituent monomers, the polymerizable monomer (b) in an amount of from 5 mol% to 50 mol% with respect to the total number of moles of the constituent monomers, and the polymerizable monomer (c) in an amount of from 1 mol% to 60 mol% with respect to the total number of moles of the constituent monomers.
- the above-mentioned constituent monomers may contain the polymerizable monomer (a), the polymerizable monomer (b), and the polymerizable monomer (c), or may consist of the polymerizable monomer (a), the polymerizable monomer (b), and the polymerizable monomer (c).
- the above-mentioned constituent monomers may contain the polymerizable monomer (a), the polymerizable monomer (b), the polymerizable monomer (c), and another polymerizable monomer (d), or may consist of the polymerizable monomer (a), the polymerizable monomer (b), the polymerizable monomer (c), and the other polymerizable monomer (d).
- the other polymerizable monomer (d) that may be contained in the constituent monomers of the above-described acrylate-based copolymer as long as the other polymerizable monomer (d) is radically polymerizable.
- examples thereof include: an acrylate-based compound except the polymerizable monomer (a), the polymerizable monomer (b), the aromatic acrylate-based monomer represented by the general formula (4), and the polymerizable monomer (c-2) in the present invention (e.g., an acrylate compound having an alkyl group having 19 or more carbon atoms, a nitrogen atom-containing alkyl acrylate compound, or a sulfur atom-containing alkyl acrylate compound); and a vinyl-based compound except the polymerizable monomer (c-1) (e.g., an alkyl vinyl ether compound, a methacrylate compound, an alkyl allyl ether compound, a nitrogen atom-containing vinyl compound, or a sulfur atom-
- R 6 in the general formula (5) represents an alkylene group having 2 to 4 carbon atoms.
- Examples of such group include an ethylene group, a propylene group, a butylene group, a methylethylene group, a methylpropylene group, and a dimethylethylene group.
- an alkylene group having 2 or 3 carbon atoms is preferred, and an ethylene group is more preferred.
- a 5 in the general formula (5) represents a hydrogen atom.
- a 5 is a hydrogen atom (not a hydrocarbon group, such as a methyl group)
- an acrylate-based copolymer that can be used as a friction reducer exhibiting a satisfactory friction-reducing effect can be obtained.
- the constituent monomers for forming the above-described acrylate-based copolymer contain a polymerizable monomer having an acrylate group in an amount of generally from 90 mol% to 100 mol%, preferably from 95 mol% to 100 mol%, more preferably from 98 mol% to 100 mol%, still more preferably from 99 mol% to 100 mol% with respect to the total number of moles of the constituent monomers, and the above-mentioned constituent monomers most preferably consist only of the polymerizable monomer having an acrylate group.
- the above-described acrylate-based copolymer be obtained from a constituent monomer consisting of the polymerizable monomer having an acrylate group without containing a polymerizable monomer having a methacrylate group.
- a polymerizable monomer produced by a known production method may be used as any of the polymerizable monomers for forming the above-described acrylate-based copolymer, or a commercially available product may be used.
- a production method there is given, for example, a method involving esterifying an alcohol, an alkylene glycol, or an aromatic alcohol having a hydrocarbon group corresponding to the structure of each monomer with acrylic acid.
- the composition ratio of the above-mentioned polymerizable monomer (a) in the acrylate-based copolymer is from at least 10 mol % with respect to the total number of moles of the constituent monomers
- the composition ratio of the polymerizable monomer (b) is from 5 mol% to 50 mol% with respect to the total number of moles of the constituent monomers
- the composition ratio of the polymerizable monomer (c) is from 1 mol% to 60 mol% with respect to the total number of moles of the constituent monomers.
- the composition ratio of the polymerizable monomer (a) in the above-mentioned constituent monomers is preferably from 15 mol% to 90 mol%, more preferably from 15 mol% to 85 mol% with respect to the total number of moles of the constituent monomers.
- the composition ratio of the polymerizable monomer (b) in the above-mentioned constituent monomers is preferably from 10 mol% to 45 mol%, more preferably from 10 mol% to 40 mol% with respect to the total number of moles of the constituent monomers under the above-mentioned conditions.
- the composition ratio of the polymerizable monomer (c) in the above-mentioned constituent monomers is preferably from 1 mol% to 50 mol%, more preferably from 5 mol% to 50 mol% with respect to the total number of moles of the constituent monomers under the above-mentioned conditions.
- the composition ratio is calculated through use of the total molar quantity thereof as the molar amount of the polymerizable monomer (a). The same applies to the polymerizable monomer (b) and the polymerizable monomer (c).
- a ratio (a):(b) between the composition ratio of the polymerizable monomer (a) and the composition ratio of the polymerizable monomer (b) in the constituent monomers for forming the acrylate-based copolymer is, for example, preferably from 20:80 to 90:10, more preferably from 30:70 to 90:10, still more preferably from 40:60 to 90:10, even more preferably from 40:60 to 70:30 by mole.
- a ratio (b):(c) between the composition ratio of the polymerizable monomer (b) and the composition ratio of the polymerizable monomer (c) in the constituent monomers for forming the acrylate-based copolymer is, for example, preferably from 10:90 to 85:15, more preferably from 20:80 to 75:25, still more preferably from 25:75 to 75:25 by mole.
- a ratio (a):(c) between the composition ratio of the polymerizable monomer (a) and the composition ratio of the polymerizable monomer (c) in the constituent monomers for forming the acrylate-based copolymer is, for example, preferably from 10:90 to 95:5, more preferably from 10:90 to 90:10, still more preferably from 15:85 to 75:25, even more preferably from 20:80 to 60:40 by mole.
- the constituent monomers for forming the above-described acrylate-based copolymer contain the polymerizable monomer (a), the polymerizable monomer (b), and the polymerizable monomer (c), or under the condition that the above-mentioned constituent monomers consist of the polymerizable monomer (a), the polymerizable monomer (b), and the polymerizable monomer (c), from the viewpoints of the friction characteristics of the acrylate-based copolymer, the constituent monomers for forming the acrylate-based copolymer contain, as the polymerizable monomer (c), the aromatic vinyl-based monomer (c-1) in an amount of preferably from 5 mol% to 60 mol%, more preferably from 10 mol% to 60 mol%, still more preferably from 15 mol% to 50 mol% with respect to the total number of moles of the constituent monomers.
- the constituent monomers for forming the above-described acrylate-based copolymer contain the aromatic vinyl-based monomer (c-1) as the polymerizable monomer (c), there is no particular limitation on a ratio between the composition ratio of the polymerizable monomer (b) and the composition ratio of the aromatic vinyl-based monomer (c-1) in the constituent monomers.
- the ratio (b):(c-1) is, for example, preferably from 10:90 to 90:10, more preferably from 20:80 to 80:20, still more preferably from 25:75 to 75:25 by mole.
- the composition ratio of the polymerizable monomer (b) in the constituent monomers is from 10 mol% to 40 mol% with respect to the total number of moles of the constituent monomers
- the composition ratio of the polymerizable monomer (c-1) is from 5 mol% to 50 mol%, preferably from 20 mol% to 50 mol% with respect to the total number of moles of the constituent monomers, and a total of the composition ratio of the polyme
- the constituent monomers for forming the above-described acrylate-based copolymer contain the polymerizable monomer (a), the polymerizable monomer (b), and the polymerizable monomer (c), or under the condition that the above-mentioned constituent monomers consist of the polymerizable monomer (a), the polymerizable monomer (b), and the polymerizable monomer (c), from the viewpoints of the friction characteristics of the acrylate-based copolymer, the constituent monomers for forming the acrylate-based copolymer contain, as the polymerizable monomer (c), the aromatic acrylate-based monomer represented by the general formula (4) in an amount of preferably from 5 mol% to 60 mol%, more preferably from 10 mol% to 60 mol%, still more preferably from 25 mol% to 45 mol% with respect to the total number of moles of the polymerizable monomers for forming the acrylate-based copolymer.
- the ratio is preferably from 10:90 to 90:10, more preferably from 20:80 to 80:20, still more preferably from 25:75 to 75:25 by mole.
- the aromatic acrylate-based monomer represented by the general formula (4) may be contained in an amount of from 1 mol% to 9 mol% with respect to the total number of moles of the polymerizable monomers for forming the acrylate-based copolymer.
- the ratio between the composition ratio of the polymerizable monomer (b) and the composition ratio of the aromatic acrylate-based monomer represented by the general formula (4) in the constituent monomers there is no particular limitation on the ratio between the composition ratio of the polymerizable monomer (b) and the composition ratio of the aromatic acrylate-based monomer represented by the general formula (4) in the constituent monomers.
- the ratio is preferably from 20:80 to 90:10, more preferably from 50:50 to 80:20, still more preferably from 60:40 to 75:25 by mole.
- the composition ratio of the polymerizable monomer (b) in the constituent monomers is from 10 mol% to 40 mol% with respect to the total number of moles of the constituent monomers
- the composition ratio of the aromatic acrylate-based monomer represented by the general formula (4) is from 5 mol% to 45 mol%, preferably from 25 mol% to 45 mol% with respect to the total number of moles of the constituent monomers, and a total of the composition
- the composition ratio of the aromatic acrylate-based monomer represented by the general formula (4) may be from 1 mol% to 9 mol% with respect to the total number of moles of the constituent monomers.
- the composition ratio of the polymerizable monomer (a) in the above-mentioned constituent monomers is preferably from 65 mol% to 90 mol%, more preferably from 71 mol% to 90 mol% with respect to the total number of moles of the constituent monomers, and the composition ratio of the polymerizable monomer (b) in the constituent monomers is preferably from 5 mol% to 20 mol% with respect to the total number of moles of the constituent monomers.
- the total of the composition ratio of the polymerizable monomer (b) and the composition ratio of the aromatic acrylate-based monomer represented by the general formula (4) be from 10 mol% to 29 mol% with respect to the total number of moles of the constituent monomers.
- a total of the composition ratios of the polymerizable monomer (a), the polymerizable monomer (b), and the polymerizable monomer (c) in the constituent monomers is preferably from 60 mol% to 100 mol%, more preferably from 70 mol% to 100 mol%, still more preferably from 80 mol% to 100 mol%, particularly preferably from 90 mol% to 100 mol% with respect to the total number of moles of the constituent monomers.
- the composition ratio of the hydroxyalkyl acrylate-based monomer is, for example, preferably from 5 mol% to 40 mol%, more preferably from 10 mol% to 30 mol% with respect to the total number of moles of the constituent monomers for forming the acrylate-based copolymer.
- a total of the composition ratios of the polymerizable monomer (a), the polymerizable monomer (b), the polymerizable monomer (c), and the hydroxyalkyl acrylate-based monomer in the constituent monomers for forming the acrylate-based copolymer is preferably from 90 mol% to 100 mol%, more preferably from 95 mol% to 100 mol%, particularly preferably 100 mol% (that is, the constituent monomers for forming the above-described acrylate-based copolymer consist of the polymerizable monomer (a), the polymerizable monomer (b), the polymerizable monomer (c), and the polymerizable monomer (d)) with respect to the total number of moles of the constituent monomers for forming the acrylate-based copolymer.
- the composition ratio is calculated through use of the total molar quantity thereof as the molar amount of the hydroxyalkyl acrylate-based monomer.
- the composition ratio of the polymerizable monomer (a) in the above-mentioned constituent monomers is from 30 mol% to 95 mol%, preferably from 60 mol% to 92 mol%, more preferably from 70 mol% to 90 mol%, even more preferably from 80 mol% to 90 mol% with respect to the total number of moles of the constituent monomers.
- the composition ratio of the polymerizable monomer (b) in the above-mentioned constituent monomers is from 5 mol% to 70 mol%, preferably from 8 mol% to 40 mol%, more preferably from 10 mol% to 30 mol%, even more preferably from 10 mol% to 20 mol% with respect to the total number of moles of the constituent monomers.
- the composition ratio is calculated through use of the total molar quantity thereof as the molar amount of the polymerizable monomer (a). The same applies to the polymerizable monomer (b).
- a ratio (a):(b) between the composition ratio of the polymerizable monomer (a) and the composition ratio of the polymerizable monomer (b) in the constituent monomers for forming the acrylate-based copolymer is, for example, preferably from 30:70 to 95:5, more preferably from 30:70 to 93:7, still more preferably from 60:40 to 92:8, even more preferably from 80:20 to 90:10 by mole.
- a total of the composition ratios of the polymerizable monomer (a) and the polymerizable monomer (b) in the constituent monomers for forming the acrylate-based copolymer is preferably from 60 mol% to 100 mol%, more preferably from 80 mol% to 100 mol%, still more preferably from 90 mol% to 100 mol%, particularly preferably 100 mol% (that is, the constituent monomers for forming the above-described acrylate-based copolymer consist of the polymerizable monomer (a) and
- the mode of polymerization of the above-described acrylate-based copolymer is not particularly limited, and the acrylate-based copolymer may be any of a block copolymer, a random copolymer, and a block/random copolymer of each polymerizable monomer.
- the weight average molecular weight of the acrylate-based copolymer is not particularly limited, but is, for example, preferably from 1,000 to 500,000, more preferably from 2,000 to 300,000. When the weight average molecular weight falls within such ranges, the acrylate-based copolymer can exhibit high friction characteristics.
- the "weight average molecular weight" as described herein may be measured by gel permeation chromatography (GPC) and determined by styrene conversion.
- the above-described acrylate-based copolymer be substantially free of metal elements and halogen atoms, and in addition, specifically, it is preferred that the acrylate-based copolymer substantially consist only of three elements of carbon, hydrogen, and oxygen.
- a method of producing the above-described acrylate-based copolymer is not particularly limited, and the acrylate-based copolymer may be produced by any method known.
- the above-described acrylate-based copolymer may be produced by subjecting polymerizable monomers to a polymerization reaction by a method, such as mass polymerization, emulsion polymerization, suspension polymerization, or solution polymerization.
- the mass polymerization or the solution polymerization is preferred as compared to a polymerization method involving using water as a solvent, such as the emulsion polymerization or the suspension polymerization, and the solution polymerization is more preferred.
- a specific method for the solution polymerization is as described below.
- a solvent and a raw material containing polymerizable monomers are loaded into a reactor at one time or in fractional amounts, and then a temperature in the reactor is increased to from about 50°C to about 120°C.
- An initiator is added in an amount of from 0.1 mol% to 10 mol% with respect to the total number of moles of the polymerizable monomers at one time or in fractional amounts, and the mixture is subjected to a reaction for from about 1 hour to about 20 hours while the mixture is stirred.
- the method may be as described below.
- the polymerizable monomers and a catalyst are loaded at one time, and then the temperature is increased to from about 50°C to about 120°C.
- the mixture is subjected to a reaction for from about 1 hour to about 20 hours while the mixture is stirred.
- solvents examples include: alcohols, such as methanol, ethanol, propanol, and butanol; hydrocarbons, such as benzene, toluene, xylene, and hexane; esters, such as ethyl acetate, butyl acetate, and isobutyl acetate; ketones, such as acetone, methyl ethyl ketone, and methyl isobutyl ketone; ethers, such as methoxybutanol, ethoxybutanol, ethylene glycol monomethyl ether, ethylene glycol dimethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol dimethyl ether, propylene glycol monobutyl ether, dioxane, and tetrahydrofuran; mineral oils, such as a paraffin-based mineral oil, a naphthene-based mineral oil, and refined mineral oils
- azo-based initiators such as 2,2'-azobis(2-methylpropionitrile), 2,2'-azobis(2-amidinopropane) dihydrochloride, 2,2'-azobis-(N,N-dimethyleneisobutylamidine) dihydrochloride, and 1,1'-azobis(cyclohexyl-1-carbonitrile); hydrogen peroxide and organic peroxides, such as benzoyl peroxide, t-butyl hydroperoxide, cumene hydroperoxide, methyl ethyl ketone peroxide, and perbenzoic acid; persulfuric acid salts, such as sodium persulfate, potassium persulfate, and ammonium persulfate; redox initiators, such as hydrogen peroxide-Fe 3+ ; and other existing radical initiators.
- azo-based initiators such as 2,2'-azobis(2-methylpropionitrile), 2,2'-azobis(2-amidinopropane) di
- the above-described acrylate-based copolymer is used as a friction reducer in a situation in which a friction-reducing effect is required. Specifically, the above-described acrylate-based copolymer is used as a lubricating oil additive. More specifically, the above-described acrylate-based copolymer is used as a friction reducer for a lubricating oil.
- the lubricating oil composition of the present invention is a lubricating oil composition containing a friction reducer consisting of the above-described acrylate-based copolymer and a base oil.
- the addition amount of the friction reducer in this case is not particularly limited, but for example, it is preferred that the above-mentioned friction reducer be contained in an amount of from 0.01 mass% to 50 mass% with respect to the total amount of the lubricating oil composition.
- the lubricating oil composition of the present invention exhibits extremely high friction-reducing performance by containing the above-mentioned friction inhibitor.
- the lubricating oil composition of the present invention contains the above-mentioned friction inhibitor in an amount of more preferably from 0.02 mass% to 20 mass%, still more preferably from 0.05 mass% to 10 mass% with respect to the total amount of the lubricating oil composition.
- the base oil that may be used in the present invention is not particularly limited, and is appropriately selected from, for example, a mineral base oil, a chemically synthesized base oil, animal and vegetable base oils, and a mixed base oil thereof depending on its intended use and use conditions.
- examples of the mineral base oil include distillates each obtained by distilling, under normal pressure, a paraffin base crude oil, a naphthene base crude oil, or an intermediate base crude oil, or distilling, under reduced pressure, the residual oil of the distillation under normal pressure, and refined oils obtained by refining these distillates in accordance with an ordinary method, specifically a solvent-refined oil, a hydrogenated refined oil, a dewaxed oil, and a clay-treated oil.
- Examples of the chemically synthesized base oil include a poly- ⁇ -olefin, polyisobutylene (polybutene), a monoester, a diester, a polyol ester, a silicic acid ester, a polyalkylene glycol, polyphenyl ether, a silicone, a fluorinated compound, an alkylbenzene, and a GTL base oil.
- a poly- ⁇ -olefin, polyisobutylene (polybutene), a diester, and a polyol ester may be universally used.
- poly- ⁇ -olefin examples include polymerized forms or oligomerized forms of 1-hexene, 1-octene, 1-nonene, 1-decene, 1-dodecene, and 1-tetradecene, or hydrogenated forms thereof.
- diester examples include diesters of dibasic acids, such as glutaric acid, adipic acid, azelaic acid, sebacic acid, and dodecanedioic acid, and alcohols, such as 2-ethylhexanol, octanol, decanol, dodecanol, and tridecanol.
- polyol ester examples include esters of polyols, such as neopentyl glycol, trimethylolethane, trimethylolpropane, pentaerythritol, dipentaerythritol, and tripentaerythritol, and fatty acids, such as caproic acid, caprylic acid, lauric acid, capric acid, myristic acid, palmitic acid, stearic acid, and oleic acid.
- esters of polyols such as neopentyl glycol, trimethylolethane, trimethylolpropane, pentaerythritol, dipentaerythritol, and tripentaerythritol
- fatty acids such as caproic acid, caprylic acid, lauric acid, capric acid, myristic acid, palmitic acid, stearic acid, and oleic acid.
- animal and vegetable base oils examples include: vegetable oils and fats, such as castor oil, olive oil, cacao butter, sesame oil, rice bran oil, safflower oil, soybean oil, camellia oil, corn oil, rapeseed oil, palm oil, palm kernel oil, sunflower oil, cotton seed oil, and coconut oil; and animal oils and fats, such as beef tallow, lard, milk fat, fish oil, and whale oil.
- vegetable oils and fats such as castor oil, olive oil, cacao butter, sesame oil, rice bran oil, safflower oil, soybean oil, camellia oil, corn oil, rapeseed oil, palm oil, palm kernel oil, sunflower oil, cotton seed oil, and coconut oil
- animal oils and fats such as beef tallow, lard, milk fat, fish oil, and whale oil.
- Those base oils may be used alone or in combination thereof.
- highly refined base oils obtained by highly refining those base oils to reduce the amounts of impurities, such as sulfur may be used.
- a base oil containing a chemically synthesized base oil such as a poly- ⁇ -olefin, polyisobutylene (polybutene), a diester, or a polyol ester
- a base oil containing a hydrocarbon oil such as a poly- ⁇ -olefin, is more preferred. It is still more preferred to use highly refined base oils of those base oils.
- one kind or more kinds of known additives such as an antioxidant, a friction-reducing agent, an abrasion-preventing agent, an oiliness improver, a cleaning agent, an ashless dispersant, a viscosity index improver, a rust inhibitor, a corrosion inhibitor, a metal deactivator, and an antifoaming agent, may be added, and those additives may be contained, for example, in a total amount of from 0.01 mass% to 50 mass% with respect to the total amount of the lubricating oil composition.
- antioxidants examples include: phenol-based antioxidants, such as 2,6-di-tertiary butylphenol ("tertiary butyl” is hereinafter abbreviated as "t-butyl"), 2,6-di-t-butyl-p-cresol, 2,6-di-t-butyl-4-methylphenol, 2,6-di-t-butyl-4-ethylphenol, 2,4-dimethyl-6-t-butylphenol, 4,4'-methylenebis(2,6-di-t-butylphenol), 4,4'-bis(2,6-di-t-butylphenol), 4,4'-bis(2-methyl-6-t-butylphenol), 2,2'-methylenebis(4-methyl-6-t-butylphenol), 2,2'-methylenebis(4-ethyl-6-t-butylphenol), 4,4'-butylidenebis(3-methyl-6-t-butylphenol), 4,4'-isopropyliden
- friction-reducing agent examples include organic molybdenum compounds, such as molybdenum dithiocarbamate and molybdenum dithiophosphate.
- molybdenum dithiocarbamate there is given, for example, a compound represented by the following general formula (6):
- R 7 to R 10 each independently represent a hydrocarbon group having 1 to 20 carbon atoms, and examples of such group include: saturated aliphatic hydrocarbon groups, such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, an octadecyl group, a nonadecyl group, and an icosyl group, and isomers of all those groups; unsaturated aliphatic hydrocarbon groups, such as an
- a saturated aliphatic hydrocarbon group and an unsaturated aliphatic hydrocarbon group are preferred, a saturated aliphatic hydrocarbon group is more preferred, and a saturated aliphatic hydrocarbon group having 3 to 15 carbon atoms is most preferred.
- X 1 to X 4 each independently represent a sulfur atom or an oxygen atom. It is preferred that X 1 and X 2 each represent a sulfur atom out of those atoms, and it is more preferred that X 1 and X 2 each represent a sulfur atom out of those atoms, and X 3 and X 4 each represent an oxygen atom out of those atoms.
- the preferred blending amount of the friction-reducing agent is an amount in which the content of molybdenum in the lubricating oil composition is from 50 mass ppm to 3,000 mass ppm, more preferably from 100 mass ppm to 2,000 mass ppm, still more preferably from 200 mass ppm to 1,500 mass ppm.
- abrasion-preventing agent examples include: sulfur-based additives, such as a sulfurized oil and fat, an olefin polysulfide, an olefin sulfide, dibenzyl sulfide, ethyl-3-[[bis(1-methylethoxy)phosphinothioyl]thio]propionate, a tris-[(2 or 4)-isoalkylphenol] thiophosphate, 3-(di-isobutoxy-thiophosphorylsulfanyl)-2-methyl-propionic acid, triphenyl phosphorothionate, ⁇ -dithiophosphorylated propionic acid, methylenebis(dibutyl dithiocarbamate), O,O-diisopropyl-dithiophosphorylethyl propionate, 2,5-bis(n-nonyldithio)-1,3,4-thiadiazole, 2,5-bis(1,1,3,3-
- R 11 to R 14 each independently represent a hydrocarbon group having 1 to 20 carbon atoms, and examples of such group include: primary alkyl groups, such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, an octadecyl group, a nonadecyl group, and an icosyl group; secondary alkyl groups, such as a secondary propyl group, a secondary butyl group, a secondary pentyl group,
- oiliness improver examples include: higher alcohols, such as oleyl alcohol and stearyl alcohol; fatty acids, such as oleic acid and stearic acid; esters, such as an oleyl glycerin ester, a stearyl glycerin ester, and a lauryl glycerin ester; amides, such as lauramide, oleamide, and stearamide; amines, such as laurylamine, oleylamine, and stearylamine; and ethers, such as lauryl glycerin ether and oleyl glycerin ether.
- the blending amount of such oiliness improver is preferably from 0.1 mass% to 5 mass%, more preferably from 0.2 mass% to 3 mass% with respect to the total amount of the lubricating oil composition.
- the cleaning agent examples include sulfonates, phenates, salicylates, and phosphates of calcium, magnesium, and barium, and overbased salts thereof. Of those, a cleaning agent having a total base number (TBN) of from 30 mgKOH/g to 500 mgKOH/g is preferred.
- TBN total base number
- the blending amount of such cleaning agent is preferably from 0.5 mass% to 10 mass%, more preferably from 1 mass% to 8 mass% with respect to the total amount of the lubricating oil composition.
- the content of a calcium element derived from the cleaning agent in the lubricating oil composition is not particularly limited, but the content of the calcium element derived from the cleaning agent in the lubricating oil composition is preferably from 100 ppm to 3,000 ppm, more preferably from 200 ppm to 2,500 ppm from the viewpoints of cleanliness.
- the content of a magnesium element derived from the cleaning agent in the lubricating oil composition is not particularly limited, but the content of the magnesium element derived from the cleaning agent in the lubricating oil composition is preferably from 50 ppm to 2,000 ppm, more preferably from 100 ppm to 1,000 ppm from the viewpoints of cleanliness.
- ashless dispersant to be used in a lubricant may be used as the ashless dispersant without any particular limitation.
- the ashless dispersant is, for example, a nitrogen-containing compound having at least one linear or branched alkyl group or alkenyl group having 40 to 400 carbon atoms in a molecule thereof, or a derivative thereof.
- the nitrogen-containing compound examples include succinimide, succinamide, a succinic acid ester, a succinic acid ester-amide, benzylamine, polyamine, polysuccinimide, and a Mannich base, and specific examples of the derivative thereof include products each obtained by subjecting any one of these nitrogen-containing compounds to a reaction with a boron compound, such as boric acid or a boric acid salt, a phosphorus compound, such as thiophosphoric acid or a thiophosphoric acid salt, an organic acid, or a hydroxypolyoxyalkylene carbonate.
- a boron compound such as boric acid or a boric acid salt
- a phosphorus compound such as thiophosphoric acid or a thiophosphoric acid salt
- organic acid or a hydroxypolyoxyalkylene carbonate
- the solubility of the compound in a base oil may reduce.
- the number of carbon atoms of the alkyl group or the alkenyl group is more than 400, the low-temperature fluidity of the lubricating oil composition may deteriorate.
- the blending amount of such ashless dispersant is preferably from 0.5 mass% to 10 mass%, more preferably from 1 mass% to 8 mass% with respect to the total amount of the lubricating oil composition.
- the viscosity index improver examples include a poly(C1-18) alkyl (meth)acrylate, a (C1-18) alkyl acrylate/(C1-18)alkyl (meth)acrylate copolymer, a diethylaminoethyl (meth)acrylate/(C1-18)alkyl (meth)acrylate copolymer, an ethylene/(C1-18)alkyl (meth)acrylate copolymer, polyisobutylene, polyalkylstyrene, an ethylene/propylene copolymer, a styrene/maleic acid ester copolymer, and a hydrogenated styrene/isoprene copolymer.
- a dispersion-type or multifunctional viscosity index improver to which dispersing performance has been imparted may be used.
- the weight average molecular weight of the viscosity index improver is from about 10,000 to about 1,500,000.
- the blending amount of such viscosity index improver is preferably from 0.1 mass% to 20 mass%, more preferably from 0.3 mass% to 15 mass% with respect to the total amount of the lubricating oil composition.
- the rust inhibitor examples include sodium nitrite, an oxidized paraffin wax calcium salt, an oxidized paraffin wax magnesium salt, a tallow fatty acid alkali metal salt, an alkaline earth metal salt or an amine salt, an alkenylsuccinic acid or an alkenylsuccinic acid half ester (the molecular weight of the alkenyl group is from about 100 to about 300), a sorbitan monoester, nonylphenol ethoxylate, and a lanolin fatty acid calcium salt.
- the blending amount of such rust inhibitor is preferably from 0.01 mass% to 3 mass%, more preferably from 0.02 mass% to 2 mass% with respect to the total amount of the lubricating oil composition.
- corrosion inhibitor or the metal deactivator examples include: triazole, tolyltriazole, benzotriazole, benzimidazole, benzothiazole, benzothiadiazole, or derivatives of these compounds, such as 2-hydroxy-N-(1H-1,2,4-triazol-3-yl)benzamide, N,N-bis(2-ethylhexyl)-[(1,2,4-triazol-1-yl)methyl]amine, N,N-bis(2-ethylhexyl)-[(1,2,4-triazol-1-yl)methyl]amine, and 2,2'-[[(4 or 5 or 1)-(2-ethylhexyl)-methyl-1H-benzotriazole-1-methyl]imino]bisethanol; and bis(poly-2-carboxyethyl)phosphinic acid, hydroxyphosphonoacetic acid, a tetraalkylthiuram disulfide, N'1,N'12-bis(
- antifoaming agent examples include polydimethylsilicone, dimethylsilicone oil, trifluoropropylmethylsilicone, colloidal silica, a polyalkyl acrylate, a polyalkyl methacrylate, an alcohol ethoxylate/propoxylate, a fatty acid ethoxylate/propoxylate, and a sorbitan partial fatty acid ester.
- the blending amount of such antifoaming agent is preferably from 0.001 mass% to 0.1 mass%, more preferably from 0.001 mass% to 0.01 mass% with respect to the total amount of the lubricating oil composition.
- the lubricating oil composition of the present invention may be used in, for example, vehicular lubricating oils (such as gasoline engine oils, diesel engine oils, and drive system oils for automobiles or motorbikes) and industrial lubricating oils (such as gear oils, turbine oils, oil film bearing oils, refrigerant lubricating oils, vacuum pump oils, lubricating oils for compression, general-purpose lubricating oils, and grease).
- vehicular lubricating oils such as gasoline engine oils, diesel engine oils, and drive system oils for automobiles or motorbikes
- industrial lubricating oils such as gear oils, turbine oils, oil film bearing oils, refrigerant lubricating oils, vacuum pump oils, lubricating oils for compression, general-purpose lubricating oils, and grease.
- the lubricating oil composition of the present invention may be suitably used in vehicular lubricating oils out of those lubricating oils.
- polymerizable monomers 25.0 g of the polymerizable monomer (a-i), 62.8 g of the polymerizable monomer (b-i), 20.5 g of the polymerizable monomer (c-1-i), 0.19 g of 2,2-azobisisobutyronitrile, and 0.51 g of 1,1-azobiscyclohexane-1-carbonitrile were added dropwise to the resultant, and a polymerization reaction was performed by stirring the mixture for 4 hours. Thus, an acrylate-based copolymer was produced.
- Friction characteristics were evaluated through use of the acrylate-based copolymer (acrylate-based copolymer 1) produced in Example 1 as a friction reducer. Specifically, an engine oil (kinematic viscosity at 100°C: 7.2 mm 2 /s, viscosity index: 167) serving as a base oil 1 and the acrylate-based copolymer 1 were added so that the content of the acrylate-based copolymer became 0.25 mass% with respect to the total amount of a lubricating oil composition. Thus, a lubricating oil composition 1 was prepared. The obtained lubricating oil composition 1 was measured for a coefficient of friction under the following test conditions with a mini-traction machine (MTM) manufactured by PCS Instruments. The average value of coefficients of friction obtained during a period of 5 minutes before the end of the test was used as the coefficient of friction. The measurement result is shown in Table 1.
- MTM mini-traction machine
- Example 2 to 7 and Comparative Examples 1 to 3 an acrylate-based copolymer having composition ratios of polymerizable monomers in Table 1 was produced by the same method as that in Example 1 except that the kinds and usage amounts of the polymerizable monomers used herein were changed.
- Each of the acrylate-based copolymers (acrylate-based copolymers 2 to 10) produced in Examples 2 to 7 and Comparative Examples 1 to 3 was measured for a coefficient of friction by the same method as that in Example 1. The results are shown in Table 1.
- Comparative Example 4 a lubricating oil composition consisting only of the base oil 1 without containing an acrylate-based copolymer was also measured for a coefficient of friction by the same method as that in Example 1.
- the above-described acrylate-based copolymer exhibits a high friction-reducing effect when used as a friction reducer, and can be suitably used as a friction reducer for a lubricating oil.
- Blending examples of fuel oil compositions prepared through use of the above-described acrylate-based copolymer, and the following base oils, friction-reducing agents, abrasion-preventing agents, cleaning agents, and ashless dispersants are shown in Tables 2 to 8.
- the blending amount of molybdenum dithiocarbamate is represented by the amount in terms of a Mo element
- the blending amount of zinc dithiophosphate is represented by the amount in terms of a P element
- the blending amount of a calcium-based cleaning agent is represented by the amount in terms of a Ca element
- the blending amount of a magnesium-based cleaning agent is represented by the amount in terms of a Mg element.
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JPH02265999A (ja) * | 1989-04-06 | 1990-10-30 | Nippon Shokubai Kagaku Kogyo Co Ltd | 洗浄剤組成物 |
JP3495764B2 (ja) | 1993-08-13 | 2004-02-09 | 旭電化工業株式会社 | 粉末状の硫化オキシモリブデンジチオカルバミン酸組成物及びその製法並びにこれを含有するグリース組成物 |
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